rgb                   package:base                   R Documentation

_R_G_B _C_o_l_o_r _S_p_e_c_i_f_i_c_a_t_i_o_n

_D_e_s_c_r_i_p_t_i_o_n:

     This function creates "colors" corresponding to the given
     intensities (between 0 and 'max') of the red, green and blue
     primaries.  The names argument may be used to provide names for
     the colors.

     The values returned by 'rgb' can be used with a 'col='
     specification in graphics functions or in 'par'.

_U_s_a_g_e:

     rgb(red, green, blue, names=NULL, maxColorValue = 1)

_A_r_g_u_m_e_n_t_s:

red, blue, green: vectors of same length with values in [0, M] where M
          is 'maxColorValue'. When this is '255', the 'red', 'blue' and
          'green' values are coerced to integers in '0:255' and the
          result is computed most efficiently.

   names: character. The names for the resulting vector.

maxColorValue: number giving the maximum of the color values range, see
          above.

_S_e_e _A_l_s_o:

     'col2rgb' the "inverse" for translating R colors to RGB vectors;
     'rainbow', 'hsv', 'gray'.

_E_x_a_m_p_l_e_s:

     rgb(0,1,0)
     (u01 <- seq(0,1, length=11))
     stopifnot(rgb(u01,u01,u01) == gray(u01))
     reds <- rgb((0:15)/15, g=0,b=0, names=paste("red",0:15,sep="."))
     reds

     rgb(0, 0:12, 0, max = 255)# integer input

